re: #7 Belafon
worldbank.org

The paper notes that construction cost of high speed rail in China tends to be lower than in other countries. China’s high speed rail with a maximum speed of 350 km/h has a typical infrastructure unit cost of about US$ 17-21m per km, with a high ratio of viaducts and tunnels, as compared with US$25-39 m per km in Europe and as high as US$ 56m per km currently estimated in California.